Spark plug



Patented May 30, 1922.

F. M. WOOD.

L D 2 J m m M 5 y a A WM 4 J K M A v 7 7 96? ..-:i- 00 N M k .e I w Y. z: I. u i B 11111 111 I. m w a w 1 m 5 7 J FRANK M. W001), 011 SACRAMENTO, CALIFORNIA;

SPARK PLUG.

Application filed January 12, 1921.

To all whom it may concern Be it known that I, FRANK M. VVoon, a citizen of the United States, residing at Sacramento, in the county of Sacramento and State of California, have invented new and useful Improvements in Spark Plugs, of which the following is a specification.

This invention relates to an internal combustion engine, and particularly pertains to a spark plug therefor.

It is a common difiiculty with internal combustion engines to maintain the ignition points of the spark plugs in a clean condition, due to the tendency for carbon to deposit thereon. It is the principal object of the present invention, therefore, to provide a spark plug, the points of which are so designed as to tend to eliminate the accumulation of carbon thereon and to insure that a desirable spark may always be obtained.

The present invention contemplates the use of a spark plug, having the usual threaded sleeve, carrying a core, the structure being otherwise provided with pyramid shaped sparking points, the sides of which are serrated to increase the surface thereof.

The invention is illustrated by way of example in the accompanying drawing, in which:

Figure l is a view in side elevation, showing the present invention.

Fig. 2 is a view in longitudinal central section, through the spark plug, embodying the invention.

Fig. 3 is a view in transverse section through the spark plug, as seen 011 the line 3-3 of Fig. 1, and as disclosing the formation of the spark point.

Referring more particularly to the drawing, 10 indicates the usual metallic threaded sleeve, adapted to be mounted within an en gine cylinder head. A core 11 is detachably positioned within the sleeve, and secured by a lock nut 12. Extending clownwardly through the core is a stem 13, which extends outwardly from the upper end of the core to form a binding post. Nuts 14 and 15 are threaded onto this post to receive the terminal connection of an electric wire. The opposite ends of the stem is formed with a spark point 16. This point is substantially in the shape of a pyramid, having four faces emanating from a base, which portion rests against the end of the core. The tapered facets are formed with longitudinal grooves 17, which are deepest Specification of Letters Iatent.

Patented May 30, 1922.

Serial No. 436,652.

at the base of the pyramid and gradually taper away as the apex is reached. This will form a contact point of the general configuration indicated in Fig. 3 of the drawings. A pair of these spark points as designated at A and B are used and are placed in longitudinal alignment with their apexes in proper relation to each other to produce a desired spark gap. The point B is formed with a short stem 18, which extends into an opening of a U-shaped hanger 19. This member is secured across the lower opened end of the sleeve 10, as shown in Fig. 1.

In operation of the present invention, the structure is assembled as shown in the drawings, and when the spark plug is electrically connected, a spark will pass across the gap between apexes of the points, thereby insuring a clean spark, and at the same time tending to prevent the accumulation of carbon upon the points. If it is desired to clean the point, they may be readily removed and sharpened, or otherwise repaired. The points may be easily interchanged when required by removing the core, thereafter withdrawing the stem of point B from its hanger and removing the lock nuts to permit the stem 13 to be withdrawn.

It will thus be seen that the structure here disclosed provides a spark plug, having sparking points, which will not easily become fouled, and may be readily cleaned or repaired.

While I have shown the preferred form of my invention, as now known to me, it will be understood that various changes might be made in the combination, construction and arrangement of parts by those skilled in the art, without departing from the spirit of the invention, as claimed.

Having thus described my invention,what I claim and desire to secure by Letters Patent, is:

1. A spark plug comprising a mounting sleeve, a core, and a pair of pyramid shaped spark points, secured to the sleeve and core, respectively, with their apexes forming a spark gap, the sides of said spark points, being longitudinally serrated.

2. A spark plug comprising a metallic sleeve, an insulating core detachably secured within said sleeve, a stem extending through said core, and forming a binding post at its outer end, a pyramid shaped spark point, formed at the opposite end of said stem, and

disposed within the mouth of the sleeve, a U-shaped hanger secured to the end of the sleeve and across the mouth thereof, and a pyramid shaped spark point, supportedb'y said hanger, and disposed relative to the first named spark point to form a spark gap between the apexes thereof, said pyramids being formed with their side facets having longitudinally extending grooves, gradually tapering from their bases to the points thereof.

3, A spark plug comprising a core, a

sleeve into which the core is entered a lock nut securing the core within the sleeve, a stem extending centrally through the core and forming a binding post at its outer end, a pyramid shaped spark point formed at the opposite end of the stem within the mouth of the sleeve, an extension on the sleeve for supporting a second pyramid shaped spark point, each of the said spark points being longitudinally serrated for in;

creasing the surface thereof. i FRANK M.-WOOD.- 

